pretty mazy and hard, but gets easy once you memorized the right directions
first few floors are ok since it needs you to find the right gate (3rd floor onwards, taking the wrong gate sends you back to the previous floor)
for the right gate for the 3rd floor.
go for the gate located on NW on the top floor.
4th floor
it has a time limit and you must gather up red, blue and yellow stones
and do not enter enter the gate at NE since it sends you back to the previous floor.
5th
next area onwards have multiple portals
and which the usual, once you got it memorized.. it will be a breeze
boss
same attacks from the one in dego.(except for some)
you can also get gander am0 and a rare fire pillar shield from clearing it.
and clearing it unlocks access to 300f and beyond (which is in a seperate portal)
inside 300f onwards
Note: these bladers inflict virus which disables you from switching bots and getting constant damage
boss: sentinel
and its 4 of them.
melee is highly not recommended again and dont get too close to it
and attack from the corners instead.
you can destroy its parts.
whenever a warning shows up
though 1 blast from a sentinel is already fatal for anyone with low hp, getting hit by 4-2 sentinels is definite insteant death.
you can get its mats for crafting
including mini sentinel lg.
and after clearing it, you will unlock the following recipes in labatory.
note: 500 hp shield
500 hp too
cancels bullets.
mini sentinel lg(+bd)
credits to rapt and zasta(for 300f onwards) for the run.